Merge pull request #167 from benehsv/kraken-polling-marketdata

Kraken polling marketdata
Merge pull request #168 from benehsv/kraken-authenticated

Implemented getAccountInfo i.e. Balances
Merge remote-tracking branch 'XChange/develop' into kraken-polling-marketdata
Added addOrder method (work in progress...)
Bug with partial orderbook fixed
Merge remote-tracking branch 'Raphael/kraken-authenticated' into kraken-polling-marketdata
created ExampleUtils
switched API Keys

Known Bug:
If the balance does not hold any money on any account the json contains an array instead of a map. This inevitably to a parsing error ...
Minor improvements to the error handling